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Title: Linear accelerator accelerating module to suppress back-acceleration of field-emitted particles

Abstract

A method for the suppression of upstream-directed field emission in RF accelerators. The method is not restricted to a certain number of cavity cells, but requires similar operating field levels in all cavities to efficiently annihilate the once accumulated energy. Such a field balance is desirable to minimize dynamic RF losses, but not necessarily achievable in reality depending on individual cavity performance, such as early Q.sub.0-drop or quench field. The method enables a significant energy reduction for upstream-directed electrons within a relatively short distance. As a result of the suppression of upstream-directed field emission, electrons will impact surfaces at rather low energies leading to reduction of dark current and less issues with heating and damage of accelerator components as well as radiation levels including neutron generation and thus radio-activation.

Inventors:
; ; ;
Issue Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1411327
Patent Number(s):
9839114
Application Number:
15/260,101
Assignee:
JEFFERSON SCIENCE ASSOCIATES, LLC (Newport News, VA); ASML. NETHERLANDS B.V. (Veldhoven, NL)
Patent Classifications (CPCs):
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05H - PLASMA TECHNIQUE
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Patent
Resource Relation:
Patent File Date: 2016 Sep 08
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Benson, Stephen V., Marhauser, Frank, Douglas, David R., and Ament, Lucas J. P. Linear accelerator accelerating module to suppress back-acceleration of field-emitted particles. United States: N. p., 2017. Web.
Benson, Stephen V., Marhauser, Frank, Douglas, David R., & Ament, Lucas J. P. Linear accelerator accelerating module to suppress back-acceleration of field-emitted particles. United States.
Benson, Stephen V., Marhauser, Frank, Douglas, David R., and Ament, Lucas J. P. Tue . "Linear accelerator accelerating module to suppress back-acceleration of field-emitted particles". United States. https://www.osti.gov/servlets/purl/1411327.
@article{osti_1411327,
title = {Linear accelerator accelerating module to suppress back-acceleration of field-emitted particles},
author = {Benson, Stephen V. and Marhauser, Frank and Douglas, David R. and Ament, Lucas J. P.},
abstractNote = {A method for the suppression of upstream-directed field emission in RF accelerators. The method is not restricted to a certain number of cavity cells, but requires similar operating field levels in all cavities to efficiently annihilate the once accumulated energy. Such a field balance is desirable to minimize dynamic RF losses, but not necessarily achievable in reality depending on individual cavity performance, such as early Q.sub.0-drop or quench field. The method enables a significant energy reduction for upstream-directed electrons within a relatively short distance. As a result of the suppression of upstream-directed field emission, electrons will impact surfaces at rather low energies leading to reduction of dark current and less issues with heating and damage of accelerator components as well as radiation levels including neutron generation and thus radio-activation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {12}
}

Works referenced in this record:

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patent, September 1968


Field emission devices
patent, June 1992


Superconducting accelerating tube and a method for manufacturing the same
patent, August 1993


Superconducting accelerating tube comprised of half-cells connected by ring shaped elements
patent, September 1994


Field emission display
patent, March 2005


Slot resonance coupled standing wave linear particle accelerator
patent-application, December 2009


Superconducting Accelerator Cavity And Method Of Manufacturing Superconducting Accelerator Cavity
patent-application, January 2013


Neutron contamination of X-ray beams produced by the Varian Clinac 1800
journal, June 1989